Common Methods for Javascript operation drop-down box

The help house (www.bkjia.com) Tutorial Project encountered the need to use javascript to operate the drop-down box, by the way, make a summary, list some common methods, the following methods have been tested on FIRFOX3.5 and IE8, if other browsers cannot run properly, contact the author.

Reference content is as follows: // Add a drop-down list Function AddDropDownList (id, fatherCtl) { If (! Document. getElementById (id )) { Var ddl = document. createElement ('select '); Ddl. setAttribute ("id", id ); If (fatherCtl & document. getElementById (fatherCtl )) Document. getElementById (fatherCtl). appendChild (ddl ); Else Document. body. appendChild (ddl ); } } // Delete the specified drop-down list Function RemoveDropDownList (id) { Var ctl = document. getElementById (id ); If (ctl) Ctl. parentNode. removeChild (ctl ); } // Add options to the drop-down list Function AddDDDLOption (id, text, value) { Var ctl = document. getElementById (id ); If (ctl) { Ctl. options [ctl. options. length] = new Option (text, value ); } } // Delete all options Function RemoveAllDDLOptions (id) { Var ctl = document. getElementById (id ); If (ctl) { Ctl. options. length = 0; } } // Delete the option of the specified index Function RemoveDDLOption (id, index) { Var ctl = document. getElementById (id ); If (ctl & ctl. options [index]) { Ctl. options [index] = null; } } // Obtain the value selected from the drop-down list Function GetDDLSelectedValue (id) { Var ctl = document. getElementById (id ); If (ctl) { Return ctl. options [ctl. selectedIndex]. value; } } // Obtain the selected text from the drop-down list Function GetDDLSelectedText (id) { Var ctl = document. getElementById (id ); If (ctl) { Return ctl. options [ctl. selectedIndex]. text; } }

From: http://www.cnblogs.com/liuwu/ Author: Liu Wu